Rotary pump



Feb. 2; 1926..

A. E. SIMPSON ROTARY PUMP Filed Nov. 21, 1923 3 Sheets-Sheetl AvmvvroeARTHUA ZT 61/ 1/290 Feb. 2 1926.

A. E. SIMPSON ROTARY PUMP I Filed Nov. 21, 1923 3 sheets-SEE: 3

Avz vra fleas mu? 61/ 1/190 Patented Feb. .2

HARREIS, B. H. VVEB B, T. M. SIL IVES? FBANKFORT, ILLINOIS.

ROTARY PUMP.

Application filed flloveniber To all aclzwnit may concern:

Be it known that l, Anti-nu: l SIHPSGIQ a citizen of the United States,and resident of the city oi? lVest l ranlritort, county oi lrauklin, andState of Illinois, have invented certain new and useful ln'iprovemeetsin Rotary Pumps, oi which the following is a specification, containing afull. clear. and exact LVN-2111131111011, reference being had toaccompanying drawings, torn'n ing a part thereof.

My invention relates to improvements in rotary puinps andhas for itsprimary object a pump provided with a rotor and pisstons, the rotorbeing mounted eccentrically of the cylinder while the pistons areconcentric so that during the rotation of the rotor and pistons, thepistons will move in and out of the rotor.

A further object is to construct a rotary pump whichis arranged as tobepractically seltcleaning so that sand or grit drawn into the pump can bereadily discharged and not retained within the pump and cause damage bygrinding; and cutting.

A still further object is to construct a Enotary pump provided with arotor and pistons, the axis of rotation of which are 111 dil'l'erentplanes and in which the pistons are driven by the rotation of the rotor.

In the drawings Fig. 1 is an end elevation of my device; Fig. 2 is aside elevation of the same; Fin: 3 a section taken on the llne 3-3 ofFig. 2 viewing the same in the direc tion 01 5118 arrow F i 41 is across section taken on the line Tli oi Fig. 1;

Fig. 5 is an enlarged end view of the piston assembly;

F 6 is a vertical section taken on the line ti l of Fig. 5;

Fig. T is a longitudinal vertical section of one of the packing barsemployed;

Fin: 8 is an end elevation of the same;

Fin; 9 is an end View of the rotor; and

Figs. 10, 11 and 12 are diagrammatic views of the rotor and pistonsshowing the position occupied by the pistons during;' various periods ofrotation.

In carrying out my invention I employ a base 13 which is provided withan elevated portion 14. lSecured to the elevated portion 1a is a pumpcylinder 15 the cyhndel 15 s Serial No. 676,022.

provided with heads 16 and 17. The cvlindcr 15 is provided with an inletopening 18 and an outlet opening 19 which are screw threaded so as toreceive the suction pipe 20 and discharge pipe 21, respectively. Withinthe cylinder 15 is located a sleeve 22 which acts as a lining for thecylinder and which is provided with a plurality of openings 22-3wl'nclrrcgister with the opening 18 and a plurality of openings 24 whichregister with the opening 19. The purpose of these openlngs will beexplained in detail later.

Formed through the heads 16 and 17 is a bore 25 through which the shaft26 extends. This opening is made eccentric to the inner circumference ofthe cylinder. In other words, it is placed below the center so that whenthe rotor 27 is secured on the shaft it will contact'with the lowerportion of the-sleeve or lining 22 and leave a crescent shaped chamber28 in the upper portion of the cylinder. In other words, the rotor 27 bycontacting with the sleeve 22 at its lower portion tends effectually toseparate the intake and outlet ports 18 and 19. The rotor 27 iscylindrical and has its opposing faces recessed so as to leave a centralweb 29 and projecting flanges 30, these flanges projecting from eitherside of the central web. Formed integral with the heads 16 and 17 arebosses 31 and 32, these bosses are cylindrical in form and concentric tothe sleeve 22 although eccentric to the opening 25. The heads 16 and 17are also provided with recesses 33 which are concentric to the bore oropening 25 and in which are located packingrings 34. These packing ringsare adapted tobear against the flanges of the rotor and are adjusted tothe rotor by means of screws 35. When this adjustment has beencompleted, it is maintained by means of lock-nuts 36.

The heads 16 and 17 are also provided with screw threaded glands 37 forthe 1cception of packing 38, this packing is compressed by means of asleeve 39, which sleeve is forced into the gland by means of nuts 10 and-l1. The nut 10 is closed with the exception. of an air vent 4-2 whichis for the pin-pose of permitting the nut to be screwed on withoutcompressing any air since the shaft 26 does not extend through the nut.The shalt 26 extends through the nut 11 and is supported in a bracket4L3, which bracket 7 is secured to the base 13. The bracket 43 isbifurcated and between the bifurcation is located a pulley 44. Mypurpose of locating the pulley 44 between the bifurcation of the bracket43 is to relieve any pull on the shaft 26 within the stufling box sothat a leak tight point can be at all times maintained.

\Vhile I have shown a pulley as the driving means it is obvious thatvarious other mechanisms can be employed ranging all the way from directmotor connections down to sprocket wheels, gear wheels, silent chaindrive or other power transmission other than belting as shown.

The cylinder 15 is provided with openings 45 into which dowel pins 46carried by the heads 16 and 17 are adapted to fit. The purpose of thesedowel pins is to insure absolute alinement of the projections 31 and 32.This is essential because if either one were twisted ever so slightlythe pistons would not function properly.

The rotor 27 is provided with diametrically opposed dovetailed groovesor slots 46 for the reception of the pistons. The pistons each consistof a ring-shaped mem-' ber 47 which have projecting therefrom arectangular member 48. This rectangular member is provided with a recessor slot 49 for the reception of a packing bar and in older to completethe piston I employ a ring-shaped member 50 which is provided with arectangular projection 51 which is also slotted as at 52, which forms acontinuation of the slot 49. The two members which form a completepiston are secured together by means of a screw 53. This division of thepiston into two sections is essential so that the piston can be fittedinto the slots 46, while the ring-shaped portions 47 and 50 pass overthe cylindrical projections 31 and which are formed integral with thecylinder heads 16 and 17. Located in the slots 49 and are packing bars54 which are provided with a central slot 55 into which a packing 56 isplaced. This packing may be either leather or other resilient materialand is intended primarily to make a tight lit between the pistons andthe sleeve 22. The lower portion of the packing bars 54 is hooked as at57, which hooks are adapted to receive the ends of a spring 58. Thepurpose of this spring being to hold the packing bars against theinterior of the sleeve 22. I

It will be noted from the drawings that the rotor .27 is secured to theshaft 26 by means of a key 59 so that the rotor and shaft will rotatesimultaneously. The heads 16 and 17 are secured to the cylinder 15 bymeans of bolts or screws 60.

In assembling my device the rotor and shaft are first secured to eachother. The piston assembly is then secured in the fob inserted thusbinding the piston and rotor assembly together. The head 17 is thenplaced in position, the packing ring 34 having been previously inserted,and then the rotor together with the piston assembly and shaft 26mounted therein. During this assembly the rings or circular portions 47and 50 are placed over the cylindrical projection 32. The head 16 whichhas had the packing ring 34 previously inserted is then placed over theshaft 26 in such a manner that the cylindrical projection 31 will enterthe ring portions 47 and 50 of the pistons which are located on theopposite side of the rotor and by means of the dowel pins 46 the twocylindrical projections 31 and 32 are brought into absolute alinement.l/Vhen this much of the assembling has been completed the heads arefastened in position by means of the screws or bolts 60. hen these havebeen tightened up sufficiently, the packing rings 34 are adjusted bymeans of the screws 35 until the proper pressure against the rotor hasbeen obtained, after which the lock-nuts 36 are seated. The glands arenow packed and the packing nuts 40 and 41 are drawn up sufficientlytight, the bifurcated bracket 43 and drive pulley 44 are next placed inposition and then the suction and discharge pipes 20 and 21 secured tothepump and to their respective terminals, after which the device isready to be connected up to the source of-power and be operated.

After the device has been assembled as previously described and theproper suction and discharge outlets made, the pump is ready foroperation. In operating the pump the rotation is in the direction of thearrow, as illustrated in Fig. 3 and the pinnping is accomplished in thefollowing manner The pulley 44 is rotated which rotates the shaft 26,the rotor 27 being keyed to the shaft is also rotated and since theshaft 26 is below the center of the cylinder lining 22., the peripheryof the rotor 27 will always remain in contact witn the lower portion ofthe cylinder so that the chamber 28 will always remain in its sameposition and never vary. The rotation of the rotor causes the pistons 43to rotate, this is due to the fact that the pistons are located in thedovetailed slots 46. The pistons are held in constant contact with theinner surface of the sleeve or lining 22 due to the fact that they aremounted concentric therewith but eccentric to the axis of rotation ofthe rotor 27. This eccentric llOunting of the pistons relative to therotor causes the pistons to work in and. out of the rotor. This isplainly shown in Figs. 10, 11 and 12. During the rotation of the pistonsand rotor, the pistons also have arocking movement relative to the rotordue to the tact that the pistons extend radially from the axis of thecylindrical projections 82, while the slots 4-6 extend radially from theaxis oi the shaft 26 and it is for this purpose that the slots 4-6 aredovetailed so as to per; mit this relative rocking movement of thepistons.

As the rotor is rotated carrying with it the pistons a suction iscreated in the pipe 20 raising liquid therein and permitting it todischarge through the openings 23 into the chamber 28. The liquid thusraised in the chamber 28 is caught by the next piston and pushed aheadof the piston, carried around over the top surface of the rotor and thendischarged through the opening 2% into the delivery pipe 21.

By my construction each piston serves a two-fold purpose, the one sidepushing the liquid ahead of it while the other side creates a suction,so each piston may be virtually said to have a forcing and suckingaction simultaneously. Of course when the piston reaches the pointbetween the openin s 23 and 24 it is wholly within the rotor andtherefore does not possess either of these actions.

An important feature of my device is that by having the inlet and outletlocated at the bottom of the pump casing the pump is made virtuallyself-cleaning. In other words, if sand or any grit is drawn into thepump chamber it is carried around and has in addition to the force ofwater being discharged from the pump to carry it away, the assistance ofgravity. This is not the case with pumps where the discharge is at anyother point than the bottom, especially when the opening is above thehorizontal center line, because in that instance, gravity acts againstthe force of water and has a tendency to retain the foreign matter andscore and scratch the interior of the pump.

By my construction of pump a constant and continuous flow is producedand ail pulsations of the liquid eliminated.

My pump is also readily reversible so that by merely reversing thedirection of rotation of the pulley 'al the suction and delivery pipesare converted respectively to delivery and suction pipes. This makes mypump especially useful in handling treating liquids where it is desiredto pump liquid from one tank into another and then pump the liquid backagain into the original tank. This can -le readily accomplished by mydevice by merely reversing the direction of the pulley 44, asatorestated.

It is also to be noted that by the constr iction of my device, no checkvalves are required due to the absence of any pulsation action in. thepump, and this absence of check valves permits my pump to be rcversible.

I My purpose of providing the sleeve 22 with the openings 23 and 24 inplace of one large opening is to permit the packing bar to be supportedat intervals across its entire face. This would not be possible were onelarger opening used for the discharge and suction outlets and inlets. Iconsequently geta more even wear entirely across the face of the packingand less liability of the packing catching and jamming the pump thanwould be possible if a single large opening were used. In thisconnection it is to be noted that the inlet and discharge openings areflaredand made larger as they approach the cylinder sothat the combinedareas of the openings 23 and 2a are equal to the area of the openings 18and 19. In this way a ready intake and discharge is permitted withoutcausing any congestion or compres sion in the liquid being pumped.

Having fully described my invention, what I claim is 1. In a rotarypump, a casing, a fixed sleeve located in said casing, heads secured tosaid casing, cylindrical projections formed integral with said heads andconcentric to said sleeve, pistons rotatably mounted on saidprojections, a shaft extending through said projections and heads andeccentric thereto, a. rotor concentrically mounted on said shaft in saidcasing and adapted to engage with and rotate said pistons, and

means for placing the rotor in operation.

2. In a rotary pump, a. casing having an outlet and an inlet port, headssecured to said casing, a sleeve having a plurality of perforationstherein in alinement with each of said ports located in said casing,pistons carried by said heads and located in said casing and rotatableconcentric therewith, a no rotor eccentrically mounted in said casingand contacting wlth said sleeve between said ports, said rotor andpistons being interlocked whereby said pistons are rotatedsimultaneously with said rotor.

3. In a rotary pump, a casing having an inlet and an outlet port, afixed sleeve located in said casing, heads secured to said casing, acylindrical projection formed integral with each of said heads andconcentric to said sleeve, pistons rotatably mounted on saidprojections, a rotor eccentrically mounted in said casing and adapted toengage with and rotate said pistons and to contact continuously withsaid sleeves at apoint between said ports, a packing adjustably carriedby said heads and adapted to contact with the ends of the rotor, andmeans for placing the rotor in operation.

4:. In a rotary pump, a casing having an outlet and an inlet port, afixed sleeve hav ing perforations in alinement with each oi said portslocated in said casing, pistons mounted in said casing and rotatableconcentric therewith, a rotor eccentrically mounted in said casing andin constant contact therewith at a point between said ports, said rotorand pistons being interlocked whereby said pistons are rotatedsimultaneously with said rotor, a packing adjustably carried by saidheads and adapted to contact with the ends of the rotor.

5. In a rotary pump having an outlet and inlet port located adjacenteach other and at the bottom of the casing, a fixed sleeve lo-' cated insaid casing and having perforations in alinement with said ports, headssecured to said casing, a shaft extending through said headseccentrically of the casing, a cylindrical projection formed integralwith the inside of each of said heads and concentric with said casing, arotor provided with diametrically opposite slots secured to said shaftand in constant contact with said sleeves between said ports and formingwith said sleeve a crescent shaped chamber, pistons rotatably mounted onsaid projections and adapted to extend through said slots, whereby saidpistons and rotor are rotated simultaneously.

6. In a rotary pump, a casing having inlet and outlet ports adjacenteach other, and heads secured to said casing, a rotor eccentricallymounted in said casing and contacting therewith only between said ports,and pistons concentrically mounted in said casing, said pistons adaptedto be driven by said rotor whereby said rotor acts as a division betweenthe suction and outlet ports, I

and the pistons are adapted to move in and out of the periphery of therotor, and pack ing adjustably carried by said heads and adapted tocontact with the ends of the rotor at its periphery.

In testimony whereof, I have signed my name to this specification.

ARTHUR E. SIMPSON.

